Screening device



Aug. 7, 1928. 1,68%,243

, F. J. BECKER I SCREENING DEVICE Original Filed Dec. 31, 1923 mg the-installation in an T nested that they can screen, the above description grinder can a funnel-shaped shell 3 Patented Aug. 7, 1928.

,"nireyrares FR NK J. Beekeeper rton ri-rftrcrmwnnna, nnwvrorl-n, assrenon rnemi J. Ia-corn, or nurraro,

or ONE-HALF 'ro NEW YORK.

SCREENING DEVICE.

Application filed December 31, 1923; Serial No. ceases.

is especially adapted to be used for screening preciousmaterial'so that all the precious particles of the ficultles. now existing' 'with devices of this kind now in use. I

Another object of my invention is to provide a screening device which is especially I adapted tobe usedin connection with a grinderin which thepulverized material. is carried away from theigrinder by air, the construction being such that the screening device can be readily placed inthe air pipe line leading fromlthe grinder without changway. Another and further object of the invenscreening device which and cheap in construcformed of parts so "conbereadily assembled or taken apart and when assembled, the various parts will "be secured together by bolts passing through each of the parts.

is exceedingly simple tion, the samefbemg A further object of my invention is Vto'provide' a screening device with a closed to for preventing the escape of the dustladen air so that all of the precious material in the air. passing through the screening device of the invention will'behereinafter set forth and thenovelfeatures thereof defined by the appended claims.

In the drawings, l Figure 1 is a diagrammatic View illustrating the installation of struction of screening device, v

Figure 2i a vertical section through the same; and r t Figure 3 is a section taken on line 3-3 of Figure 2.

In the drawing 1 indicates a grinder, and

2 the air pipe leading from'the grinder for conveying the material to the separator or i i being given so that the application of my improved construction of a screening device to the ordinary pipe line used in connection with a be readily understood. In carrying out myinvention I employ provided with an and a lateral discharge chute 5.

opening 4 e upper edge of the funnel-shaped shell 3 materials to be screened can be collected, thereby overcoming the dif screen and dropping by g my improved convf Renewed January 25, 1928.

is provided with an annular is apertured as clearly shown and for the purpose hereinafter fully described.

Arranged within the sh l conical shaped screen 7 carried by a frame flan 6 which rest on the flange 6 of 'vided with depending ribs 9 forming a support for the screen 7 so as to sp away from the inner wall of the shell 3.

aid ring 8 also closes the i the upper edge of the screen portion or edge of the shell 3;

Arranged over the shell is a cover section 10 having an annular flange 11 apertured to ring 8 of e screen support and through which bolts 12 are adapted to pass for CllIlI1Z the cover, screen support and shell J as clearly shown, the cover being of substantially the same diameter as the upper end of the funnel shaped shell. cover is provided with a tangentially arthe pipe 2. will enter the cover in such a manner that a whirling material i obtained'within the shell the coarser particles of material striking the charged through a discharge spout 14 formed shell 3 and the cover 10 may be said to comprise a casing which is entirely closed except or the inlet 13, the discharge opening 4 and the, di charge chute 5.

he smaller particles which are thrown up against the screen pass through and are carried with the current of air out the screen i register with the apertures of the the discharge spout 5 into a settling chain ber 15 from which they can be collected.

From the foregoing description it will be seen that I have provided a screening device in which a casing is formed having a closed top and. provided with a at its lower larger particles or tailings of the material to be separated to pass out through the discharge spout while the smaller particles which are carried by the curent of air, pass i and the air allowed to pass out of the settling and no vent is provided through it, all the 1 through the posed inlet, and bolts passing Since discharge through the screen and are conveyed to a settling chamber wherethey arecollected chamber. 7

By constructing the screening device in this particular manner, the current of dustladen air entering the closed top of the receptacle causes a whirling action of the air and material carried thereby so as to throw the same against the screen in order to separate the finer particles from the coarser particles, the finer particles passing out of the receptacle with the current of air. v As shown in the drawing, the screen 7 is spaced away-from shell 8, a distance great enouh-to provide for the free air which comes in through air pipe 2. Also the discharge chute 5 is made of greater diameter than air "pipe 2; whereas, discharge spout 14 is of lesser diameter than air pipe 2. Since the cover .10 is locked down air that comes in by pipe 2 must escape by either outlet chute5 or discharge spout 14. spout 14 is smaller than the air cannot all escape and there will be a tendto build up inside the outlet pipe 5, through this pipe, ency for pressurescreen. .However, since discharge chute 5* is larger than the'inlet, the pressure diflerence inside and outside this screen will be only'enough to cause the all" current to flow back pressure will build up; thus very little air will be forced out discharge spout 14 The air current passing through screen will assist the centrifugal force generated inthedevice in shifting the material will'carry out of the mechanism all of the fine material which, as has been pointed out, can be collected, for example, in a settling chamber 15. v

What I claim is p 3 7 14 A screening device ofthe kind described comprising a eral discharge spout, said shell being provided with an annular flange at its upper edge, aring disposed depending converging ribsterminatin'g short of the end of the shill, a iunnel-shaped screen disposed on said ribs terminating short of the bottom of theends of the ribs, having an annular flange disposed on said ringand provided with a tangentially disthrough said ring and flanges 0f the shell and cover rethe shell adjacent flow of the.

. current upper end screen and substantially no and v funnel-shaped shellhaving anopening in its bottom and a laton said flange having a closed circular cover.

spectively for securing said members" together.

2. A screening ldevice for fine materials;

comprising in combination an inverted econical screen; a shell enclosing the same with the wall of the-shellspaced therefrom, said shell; at its upper portion being closed ex= cept for a tangential inlet through which the material to be screened is introduced by an air current into the upper portion of the screen; a discharge pipe of smaller cross sectional area than the inlet'leading from the bottom of the screen; a discharge pipe leading from said shell of suiiicient cross sectional area so that'the pressure on the outside ofsaid screenwill be less pressure inside said screen, whereby the air will be caused to screen; and collecting 'meansconnected with said last mentioned discharge pipe. v

3. A structure as definedin claim 2, in

which the second mentioned dischargepipe than the V v flow through said has a greatercross-sectional:area than the inlet pipe; r r

4. A. screening 7 V 7 comprising in combination an inverted-con spaced away therefrom, the upper end of devicelfor fine materials I ical screen; a casing enclosing the same, and

the casing being closed and opening only into the Jupper open end of the screen, sai

of the casing being-provided with a tangential inlet through which the material to be screened is introduced by an air v current; a discharge pipe for the lower end of the screen; and from thelower portion of the space formed between the screen andi'casing. V

5.. A screening device; for fine materials- 'a' discharge pipe leading comprising in combination a ring shaped member; aplurality of ribs extending clown-- wardly therefrom,

wardtheir lower ends;

said ribs converging toan nverted conical screen mounted on said ribs and making a V close fit with the rin'g said screen-being open atits lowerend; a discharge pipe extending thereiroin; a conical shell placed about the ribs andlield in'spaced'relation to the screen by said ribs; a discharge spout opening into the lower end 7 i a closed cover overlying the upperopen end f the screen, saidcover being'providedwith' a tangential inlet forthe introduction of an 7 air current Vcarryi'iig the material v to be fthe shell; and

screened, said inlet heing of an area less than that of the discharge spout;

In testimony whereof; hereunto aifiX my signature.

" ream; JgBECKEB, 

